I seem to remember ages ago when we first claimed child benefit there was something about the named person being able to get National Insurance credits if they didn't work or something and thought - that won't apply to me i'll always be working 
anyway, i wondered if i needed to do anything to activate this as i only earnt a few hundred pounds in the tax year 10-11 and can't believe i have paid enough NI
Do i need to contact anyone or does it happen automatically?
TIA